For example, Lynda Birkea feminist biologist, states that "'biology' is not seen as something which might change. By definition, males have small, mobile gametes sperm ; females have large and generally immobile gametes ova or eggs.
Archived from the original PDF on 15 June New Jersey: Upper Saddie River.
For example, greater male propensity toward physical aggression and risk taking would be termed a "sex difference;" the generally longer head hair length of females would be termed a "gender difference. Food and Drug Administration. The International Journal of Psychoanalysis, volume 45 issues 2 to 3, pages to However, there are many different challenges in collecting and reporting gender information.
Nurture Archived at the Wayback Machine. These terms suggest that the behavior of an individual can be partitioned into separate biological and cultural factors. Press, 1st Harvard Univ.
Retrieved on The word 'sex' refers ambiguously to copulation and to sexual dimorphism Retrieved 14 April
In paragraph Archived PDF from the original on 3 March Archived from the original on August 9, Archived from the original PDF on 2 September Furthermore, indiscriminate use of the word gender tends to obscure the distinction between two different topics: a differences between males and females, and b individual differences in maleness and femaleness that occur within each sex.